M100, Messier 100 (aka NGC 4321) is a grand design intermediate spiral galaxy located within the southern part of constellation Coma Berenices.
It is over 107,000 light years in diameter, and is located at 55 million light years from Earth.
As you can see M100 spiral has lots of galaxy friends nearby, and if you scan the background carefully you will see many more tiny galaxies as faint as 18th magnitude in this FOV. I have marked the brighter 15th- 16th mag.ones.
This is a 180 minute exposure with my C6 F5 Newtonian Telescope, coma Corrector, & QHY183M cooled Monochrome(LUM) & QHY183C Cooled Color(RGB) Cmos Cameras, tracking on a Bisque MyT robotic Mount, captured from my backyard in Dayton on 03-04-2020.